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Push Notification Open Rate

A medium SQL mock interview question on DataDriven. Practice with AI-powered feedback, real code execution, and a hire/no-hire decision.

Domain
SQL
Difficulty
medium
Seniority
L4

Interview Prompt

For each date a push notification was sent, calculate the open rate: notifications with opened = true divided by total notifications sent that day. Only include send dates where at least one notification was eventually opened, regardless of when the open occurred.

Summary

Push sent. How many opened?

How This Interview Works

  1. Read the vague prompt (just like a real interview)
  2. Ask clarifying questions to the AI interviewer
  3. Write your sql solution with real code execution
  4. Get instant feedback and a hire/no-hire decision

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